Contact photographic process for producing a planographic printing plate

Claim 2

A process for producing a planographic printing plate which comprises (1) intimately contacting, using a vacuum contact method, an original image with the outermost layer of a light-sensitive printing plate precursor comprising (a) a support, (b) a light-sensitive layer on said support (a), said light-sensitive layer being present in a coating amount of 0.2 to 7 g/m 2 and comprising (i) a negative-working composition containing a diazo resin, or (ii) a positive working composition containing an o-diazooxide-based light-sensitive material, a phototungstic acid salt of a diazo resin, a hexacyanferrate salt of a diazo resin, or a diazo resin and polyvinyl hydrogenphthalate, and (c) a matt layer comprising a resin layer with particles of a matt agent dispersed therein on said light-sensitive layer (b), said matt layer having a surface coarseness Ha ranging from 0.4 to 4 microns and said particles having a particle size of about 2 to 40 microns; (2) exposing said light-sensitive printing plate precursor to active rays through said original image, and then (3) removing with a developing solution either the exposed area or the unexposed area of said light-sensitive layer (b) and substantially the entire matt layer (c), thereby to prepare said printing plate.

Claim 3

The process according to claim 1, wherein said light-sensitive layer comprises a negative-working composition containing a diazo resin.

Claim 4

The process according to claim 1, wherein said light-sensitive layer comprises a positive-working composition containing an o-diazooxide-based light-sensitive material.

Claim 5

The process according to claim 3, wherein said particles have a particle size of about 8 to 15 microns.

Claim 6

The process according to claim 4, wherein the support (a) is an aluminum plate.

Claim 7

The process according to claim 4, wherein the surface coarseness Ha ranges from about 0.8 to 1.3 microns.

Claim 8

The process according to claim 1, wherein said light-sensitive layer comprises a positive-working composition containing a phosphotungstic acid salt of a diazo resin.

Claim 9

The process according to claim 3, wherein said resin of the matt layer (c) is selected from the group consisting of a cellulose, polyvinyl alcohol, polyvinyl pyrrolidone and sodium polyvinylbenzene sulfonate.

Claim 10

The process according to claim 8, wherein said cellulose is sodium cellulose xanthate, ethyl cellulose, hydroxyethyl cellulose, hydroxypropylmethyl cellulose or carboxymethyl cellulose.

Claim 11

The process according to claim 8, wherein said particles of the matting agent are selected from the group consisting of SiO 2 particles, ZnO particles, titanium oxide particles, zirconium particles, glass particles and alumina particles.

Claim 12

The process according to claim 1, wherein said light-sensitive layer comprises a positive-working composition containing a hexacyanoferrate salt of a diazo resin.

Claim 13

The process according to claim 1, wherein said light-sensitive layer comprises a positive-working composition containing a diazo resin and polyvinyl hydrogenphthalate.

Claim 14

A process for producing a planographic printing plate which comprises (1) intimately contacting, using a vacuum contact method, an original image with the outermost layer of a light-sensitive printing plate precursor comprising (a) a support, (b) a light-sensitive layer on said support (a), said light-sensitive layer being present in a coating amount of 0.2 to 7 g/m 2 and containing a member selected from the group consisting of a diazo resin, an azide compound, and polyvinyl cinnamate as a light-sensitive component of said light-sensitive layer, (c) a matt layer comprising a resin layer with particles of a matt agent dispersed therein on said light-sensitive layer (b), said matt layer having a surface coarseness Ha ranging from about 0.4 to 4 microns and said particles having a particle size of about 2 to 40 microns, and (d) a layer of an oleophilic, hydrophobic, water-insoluble and solvent-softenable resin between said light-sensitive layer (b) and said matt layer (c); (2) exposing said light-sensitive printing plate precursor to active rays through said original image, and (3) removing with a developing solution either the exposed area or the unexposed area of said light-sensitive layer (b) and substantially the entire matt layer (c), thereby to prepare said printing plate.

Claim 15

A process for producing a planographic printing plate which comprises (1) intimately contacting, using a vacuum contact method, an original image with the outermost layer of a light-sensitive printing plate precursor comprising (a) a support, (b) a light-sensitive layer on said support (a), said light-sensitive layer being present in a coating amount of 0.2 to 7 g/m 2 and containing a member selected from the group consisting of a diazo resin, an azide compound, and polyvinyl cinnamate as a light-sensitive component of said light-sensitive layer, (c) a matt layer comprising a resin layer with particles of a matt agent dispersed therein on said light-sensitive layer (b), said matt layer having a surface coarseness Ha ranging from about 0.4 to 4 microns and said particles having a particle size of about 2 to 40 microns, and (d) a layer of an oleophilic, hydrophobic, water-insoluble and solvent-softenable resin between said light-sensitive layer (b) and said matt layer (c); (2) exposing said light-sensitive printing plate precursor to active rays through said original image, and (3) removing with a developing solution either the exposed area or the unexposed area of said light-sensitive layer (b) and substantially the entire matt layer (c), thereby to prepare said printing plate.

Claim 16

The process according to claim 13, wherein support (a) is selected from the group consisting of paper, a synthetic resin laminated paper, a metal plate, a synthetic resin film, a paper with a metal layer laminated or deposited thereon and a synthetic resin film with a metal layer laminated or deposited thereon.

Claim 17

The process according to claim 13, wherein the support (a) is an aluminum plate.

Claim 18

The process according to claim 13, wherein the support (a) is a composite sheet comprising an aluminum sheet on a polyethylene terephthalate film.

Claim 19

The process according to claim 13, wherein the matt agent is present in said matt layer (c) in an amount of about 0.05 to 4 parts by weight by part by weight of the resin in the matt layer (c).

Claim 20

The process according to claim 13, wherein (i) said resin of the matt layer (c) is a resin soluble in water and said matt agent in the matt layer (c) is selected from the group consisting of particles insoluble in water but soluble in an organic solvent and particles insoluble in both water and an organic solvent, or (ii) said resin of said matt layer (c) is a resin soluble in an organic solvent and said matt agent in said matt layer (c) is selected from the group consisting of particles soluble in water and insoluble in an organic solvent and particles insoluble both in water and an organic solvent.

Claim 21

The process according to claim 18, wherein said resin soluble in water is selected from the group consisting of a cellulose, a starch, polyvinyl alcohol, a polyethylene oxide, polyacrylic acid, polyacrylamide and polyvinyl methyl ether, said particles soluble in an organic solvent but insoluble in water are polymer particles, said particles insoluble in both water and an organic solvent are selected from the group consisting of SiO 2 particles, ZnO particles, titanium oxide particles, zirconium particles, glass particles and alumina particles, said resin soluble in an organic solvent is selected from the group consisting of an epoxy resin, a phenol resin, a polyamide resin and polyvinyl butyral, and said particles soluble in water but insoluble in an organic solvent are starch particles.

Claim 22

The process according to claim 13, wherein the surface coarseness Ha ranges from about 0.8 to 1.3 microns.

Claim 23

The process according to claim 13, wherein said particles have a particle size of about 8 to 15 microns.

Claim 24

The process according to claim 13, wherein said support (a) is an aluminum plate and said particles have a particle size of about 8 to 15 microns.

Claim 25

The process according to claim 13, wherein said light-sensitive component of said light-sensitive layer (b) is said diazo resin.

Claim 26

The process according to claim 13, wherein said light-sensitive layer contains a diazo resin as the light-sensitive component.

Claim 27

The process according to claim 13, wherein said light-sensitive layer contains an azide compound as the light-sensitive component.

Claim 28

The process according to claim 13, wherein said light-sensitive layer contains a polyvinyl cinnamate as the light-sensitive component.

Claim 29

A process for producing a planographic printing plate which comprises (1) intimately contacting, using a vacuum contact method, an original image with the outermost layer of a light-sensitive printing plate precursor comprising (a) a support, (b) a light-sensitive layer on said support (a), said light-sensitive layer being present in a coating amount of 0.2 to 7 g/m 2 and comprising (i) a negative-working composition containing a diazo resin, an azide light-sensitive material, a light-sensitive resin having an unsaturated double bond in the molecule which undergoes a dimerization reaction upon irradiation with active rays thereby becoming insoluble, or ethylene-based unsaturated compounds which have at least two unsaturated double bonds and undergo a polymerization reaction upon irradiation of active rays, or (ii) a positive-working composition containing an o-diazooxide-based light-sensitive material, a phosphotungstic acid salt of a diazo resin, a hexacyanoferrate salt of a diazo resin, a diazo resin and polyvinyl hydrogenphthalate, or a light-sensitive composition containing linear polyamides and monomers containing an addition polymerizable unsaturated bond, (c) a matt layer comprising a resin layer with particles of a matt agent dispersed therein on said light-sensitive layer (b), said matt layer having a surface coarseness Ha ranging from about 0.4 to 4 microns and said particles having a particle size of about 2 to 40 microns, and (d) a layer of an oleophilic, hydrophobic, water-insoluble and solvent-softenable resin between the light-sensitive layer (b) and the matt layer (c); (2) exposing said light-sensitive printing plate precursor to active rays through said original image, and then (3) removing with a developing solution either the exposed area or the unexposed area of said light-sensitive layer (b) and substantially the entire matt layer (c), thereby to prepare said printing plate.

Claim 30

A process for producing a planographic printing plate which comprises (1) intimately contacting, using a vacuum contact method, an original image with the outermost layer of a light-sensitive printing plate precursor comprising (a) a support, (b) a light-sensitive layer on said support (a), said light-sensitive layer being present in a coating amount of 0.2 to 7 g/m 2 and comprising (i) a negative-working composition containing a diazo resin, an azide light-sensitive material, a light-sensitive resin having an unsaturated double bond in the molecule which undergoes a dimerization reaction upon irradiation with active rays thereby becoming insoluble, or ethylene-based unsaturated compounds which have at least two unsaturated double bonds and undergo a polymerization reaction upon irradiation of active rays, or (ii) a positive-working composition containing an o-diazooxide-based light-sensitive material, a phosphotungstic acid salt of a diazo resin, a hexacyanoferrate salt of a diazo resin, a diazo resin and polyvinyl hydrogenphthalate, or a light-sensitive composition containing linear polyamides and monomers containing an addition polymerizable unsaturated bond, (c) a matt layer comprising a resin layer with particles of a matt agent dispersed therein on said light-sensitive layer (b), said matt layer having a surface coarseness Ha ranging from about 0.4 to 4 microns and said particles having a particle size of about 2 to 40 microns, and (d) a layer of an oleophilic, hydrophobic, water-insoluble and solvent-softenable resin between the light-sensitive layer (b) and the matt layer (c); (2) exposing said light-sensitive printing plate precursor to active rays through said original image, and then (3) removing with a developing solution either the exposed area or the unexposed area of said light-sensitive layer (b) and substantially the entire matt layer (c), thereby to prepare said printing plate.

Claim 31

The process according to claim 27, wherein the surface coarseness Ha ranges from 0.8 to about 1.3 microns.

Claim 32

The process according to claim 27, wherein said particles have a particle size of about 8 to 15 microns.

Claim 33

The process according to claim 27, wherein said light-sensitive layer comprises a negative-working composition containing a diazo resin.

Claim 34

The process according to claim 27, wherein said light-sensitive layer comprises a negative-working composition contaning an azide light-sensitive material.

Claim 35

The process according to claim 27, wherein said light-sensitive layer comprises a negative-working composition containing a light-sensitive resin having an unsaturated double bond in the molecule which undergoes a dimerization reaction upon irradiation with active rays thereby becoming insoluble.

Claim 36

The process according to claim 27, wherein said light-sensitive layer comprises a negative-working composition containing ethylene-based unsaturated compounds which have at least two unsaturated compounds which have at least two unsaturated double bonds and undergo a polymerization reaction upon irradiation of active rays.

Claim 37

The process according to claim 27, wherein said light-sensitive layer comprises a positive-working composition containing an o-diazooixde-based light-sensitive material.

Claim 38

The process according to claim 27, wherein said light-sensitive layer comprises a positive-working composition containing a phosphotungstic acid salt of a diazo resin.

Claim 39

The process according to claim 27, wherein said light-sensitive layer comprises a positive-working composition containing a hexacyanoferrate salt of a diazo resin.

Claim 40

The process according to claim 27, wherein said light-sensitive layer comprises a positive-working composition containing a diazo resin and polyvinyl hydrogenphthalate.

Claim 41

The process according to claim 27, wherein said light-sensitive layer comprises a positive-working composition containing a light-sensitive composition containing linear polyamides and monomers containing an addition polymerizable unsaturated bond.